College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
J Hazard Mater. 2023 Jan 5;441:129863. doi: 10.1016/j.jhazmat.2022.129863. Epub 2022 Aug 27.
Heavy metals (HMs) from smelters pose severe challenges to the environmental soil quality of surrounding farmlands, and threaten human health through the food chain. This study explored the environmental effects of smelting activities on farmland soil, and additionally assessed the enrichment, transfer and health risk of HMs in soil-wheat systems. Multiple characterization results were combined to demonstrate that HMs from smelter waste were transferred to the surrounding soil. It was determined that the enrichment of HMs in soil-wheat systems is mainly controlled by the total HM concentration and pH in soil. Furthermore, the priority pollutant in soil-wheat systems was found to be Cd, and Cd affected the transfer of Cu, Mn and Pb from soil to wheat roots. Interestingly, the -OH stretching, C-H stretching, N-H amide and C-O bending were involved in detoxifying HMs in wheat. The mean values of non-carcinogenic and carcinogenic risks by consuming wheat grain were 9.1, 1.4E-02 (adults) and 11.3, 3.3E-03 (children), respectively, indicating a noteworthy health risk. This study highlighted the critical issues arising from Pb/Zn smelting activities on agricultural soils. Notwithstanding, to ensure food security, the affected regions could opt to follow up on the type of crops grown.
冶炼厂产生的重金属（HMs）对周边农田的环境土壤质量构成了严重威胁，并通过食物链威胁到人类健康。本研究探讨了冶炼活动对农田土壤的环境影响，此外还评估了土壤-小麦系统中 HMs 的富集、迁移和健康风险。多种特征化结果表明，冶炼厂废物中的 HMs 被转移到了周围的土壤中。研究结果表明，土壤-小麦系统中 HMs 的富集主要受土壤中总 HMs 浓度和 pH 值的控制。此外，土壤-小麦系统中的优先污染物被确定为 Cd，Cd 影响了 Cu、Mn 和 Pb 从土壤向小麦根系的迁移。有趣的是，-OH 伸缩、C-H 伸缩、N-H 酰胺和 C-O 弯曲参与了小麦中 HMs 的解毒。食用小麦籽粒的非致癌和致癌风险的平均值分别为 9.1、1.4E-02（成人）和 11.3、3.3E-03（儿童），表明存在显著的健康风险。本研究强调了 Pb/Zn 冶炼活动对农业土壤造成的关键问题。然而，为了确保食品安全，受影响的地区可以选择关注种植的作物类型。
